Molding-machine



W. P. KRAUSE.

MOLDING MACHINE.

APPLICATION FILED MAR. 29, I911- 1,328,527, Patented Jan. 20, 1920.

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' MOLDING MACHINE APPLICATION FILED MAR .29 l9|1- 1,328,527. Patented Jan. 20,1920.

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W. P. KRAUSE.

v MOLDING MACHINE.

I APPLICATION FILED MAR. 29,1917- 1,328,527, 1 Patented Jan. 20,1920.

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UNITED STATES PATENT OFFICE.

WILLIAM P. KRAUSE, OF CHICAGO, ILLINOIS, ASSIGNOR TO MUMFOBD MOLDING MACHINE COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

MOLDING-MACHINE.

Patented Jan. 20, 1920.

To all whom it may concern:

Be it known that 1, WILLIAM P. KRAUsE, a citizen of the United States, residing at Chicago, in the county of Cook and-State of Illinois, have invented certain new and useful Improvements in Molding-Machines, of which the following is a specification.

This invention relates to improvements in molding machines and has for its object to provide a new and improved construction of combination jolt-ramming and squeezing machine, in which the two functions, namely, jolting and squeezing, are performed within the one machine at the will of the operator.

My improved construction comprises the use of a single compound plunger having two portions of different diameters, operating fluid being admitted beneath the excess diameter of the one portion for jolting, and beneath the portion of smaller diameter for squeezing. U

Another object resides in the specific construction which provides for the location and arrangement of the joltcontrolling valve, the same being of a type known as Mumford-Huggins and illustrated in the patent to said parties No. 1,167,511.

These and other objects will be more fully set forth and described in the following specification and shown in the accompanying drawings, in which Figure 1 is a rear elevation of my improved machine. 7

Fig. 2 is .a transverse vertical section thereof.

Fig. 3 is a horizontal section along the line 3-3 of Fig. 2; and

Fig. 1 is a detail vertical section the line 41 of Fig. 3. v v 7 Like numerals refer to like elements throughout the drawings, in which 10 designates, generally, the base of my machine, to which are pivotally attached the yoke arms 11 carryingthe squeezer-head 12 shown in Fig. 2. The base 10 is provided with a table portion 10 to which is secured, by bolts 10 or the like, a cylinder 13, suitable packing 13 being provided therebetween as shown in Fig. 2 for example. A duct 10 extends through a portion of the base 10, to and through the table portion 10 to communicate with the interior of cylinder 13 and a fluid pressure supply pipe 14: in communication therewith of suitable form, a twoalong way valve 15 being provided to control the supply and exhaust of air, or other operating fluid, through the pipe 14, as will be more fully explained.

The cylinder 13 is constructed with the upper portion thereof larger than the lower portion, a shoulder 13 resulting from this difference in diameter. This shoulder is located intermediate the extremities of the cylinder and for a purpose to be described later. Reciprocably mounted in the cylinder 13 is the plunger or piston 16 having an upper portion 16 and a lower portion 16 such portions fitting closely within the clifferent sized portions of the cylinder 13, as shown in Fig. 2, ashoulder 16 being located at the junction of the two different sized plunger portions. The cylinder 13 is provided with an outwardly extending flange 18 surrounding an aperture or transverse bore, in which is mounted the valve block 17 provided with a face-plate secured by studs 18, or the like, to the flange 13 The valve block 17 projects into the cylinder 13, and provision therefor is made by constructing the plunger 16 with a cavity or recess 16 permitting reciprocation of the cylinder without interference by the inwardly projecting valve block 17 This valve'block embodies a construction of the Mumford Huggins valve type, and is provided with an inlet or supply duct 17 'comn'iunicating with a peripheral passage or chamber 17 within which is located the valve seat 17 A valve 19 coacts with this valve seat when in closing position and is provided with an upwardly extending stem portion 19, the same extending upwardly through a suitable aperture in the valve block 17 to a point-beneath the striker-pin 20 carried by a portion of the cylinder 16, as indicated in Fig. 2. The passagel? communicates with a second peripheral passage 17 located upwardly thereof, from which leads the outlet duct 17 shown, for example, in dotted lines in Fig. 2 and in full lines in Fig. Referring to the latter figure, it-will be seen that a communicating pipe/01' duct 21 leads from. outlet duct 17 to cylinder supply inlet 13 leading to the interior of the upper portion of the cylinder 13. A bleed passage 17 g leads from the inlet duct 17 to beneath the valve 19, the area on the lower surface of the latter being greater than that on the upper surface, as will be obvious. The cylinder 13 is provided with an exhaust passage or duct 13 located a predetermined distance above the inlet 13*, as shown in Fig. 4, and the adjacent portion of the piston portion 16 is provided with a by-pass 16 normally in communication with shoulder 13- when the plunger 16 is in lowermost position, the plunger being provided with a slight boss 16 at the bottom thereof to provide a clearance between the plunger and the bottom of the cylinder. The shoulder 16 of the plunger is so located as to slightly clear the shoulder 13 when in lowermost position, and the by-pass 16 leads to the surface of the plunger 16 beneath the shoulder 16, so that when air or other operating fluid is admitted through inlet 13 it will flow through by-pass 16 and surround the smaller portion 16 of the piston beneath the shoulder 16 and operate to raise the plunger 16. The distance between inlet 13 and outlet 13 as shown in Fig; 1, is slightly greater than the height of the inlet opening of the by-pass 16 lVhen operating fluid under pressure is admitted through duct 17 a in the valve block 17 with the piston in the position shown in Fig. 3, such air will. flow through outlet 17 pipe 21, and inlet 13 to beneath the shoulder 16, whereupon the plunger will rise carrying with it the striker 20. As the plunger rises the inlet 13 is closed, whereupon fiow ceases through inlet duct 17, and the pressure of the operating fluid is immediately transmitted in full to beneath the valve 19, and owing to the larger lower area thereof this valve is immediately raised during the interval of travel of plunger port 16 from cutting oil of inlet to opening of exhaust, cutting off further possibility of flow of air. As the inlet 13 is closed, the exhaust 18 has not yet opened, but the expansion of the entrapped operating fluid coupled with the momentum of the rising plunger sufiices to carry the bypass 16 into communication with the ex haust 13, whereupon a large portion of the operating fluid is suddenly exhausted, and the pressure of the same suddenly dropping, the weight of the plunger and its load results in the rapid drop of the same until it jolts upon the bottom of the cylinder. At the same time the striker pin 20 positively moves the valve stem 19 to open position thereby opening the pressure supply again, resulting in the repetition of the above-described cycle of operation. This repetition, being rapid, results in the necessary jolting. A supply tube or pipe 26 is provided, leading to the inlet duct 17 from a manually operable valve 27, the same being operable, as will be obvious, to shut off or open communication from the main air supply to duct 26.

The usual table 30 is carried upon the top of plunger 16. When it is desirable to squeeze a mold carried by this table, air is admitted through duct 10 directly beneath the plunger l6 from a main supply duct 14, the flow 'being controlled by means of the two-way valve 15, the same being manually operable to open a flow of air through duct 10%. whereupon the plunger 16 will be positively raised until the mold impacts with the squeezer-head 12. After the squeezing the valve 15 is operatedto permit exhaust of the air through passage 10, and when squeezing is not being performed the twoway valve is left in such position as to leave the exhaust open whereupon no suction will be present during the j olting operation, since free ingress and egress of the air beneath the piston portion 16 is permitted, as will be obvious. In this embodiment of my invention the area of the excess of the bottom of the larger piston portion over the lower piston portion, 6., the effective area for jolting, is considerably smaller than the effective area of the squeezing portion,-since less area is needed for the former function.

It will be obvious from the above description and the accompanying drawings, that I have provided a compact form of combination jolt and squeeze machine, utilizing a single plunger and cylinder mechanism,capable of efficient and practical operation. It will also be apparent that my improved machine is susceptible of modifications and changes, and I would not wish to be restricted to. the form shown and described, save as defined in the appended claims.

What I claim is:

1. In a machine of the class described, a cylinder, a plunger reciprocably mounted in said cylinder, said plunger being recessed, and a jolt-valve mechanism projecting through said cylinder into said recess and coacting with said plunger to control the jolting thereof.

2. A machine of the class described comprising a cylinder having a large and a small portion, a plungerhaving a large and a small portion reciprocably mounted in the similar portions of said cylinder, means to admit operating fluid beneath the larger portion of said plunger for jolting, means to admit operating fluid beneath the smaller portion of said plunger for squeezing, said plunger being recessed, and valve-controlling mechanism coacting with said plunger to effect the jolting thereof, said mechanism projecting into said plunger recess.

In testimony whereof I have subscribed m name.

WILLIAM P. KRAUSE.

Witnesses:

R. HWQQDL ND, H. Woutrnt. 

